Multi Server Session Functionality

Fix #1130
Adds the server id in the SQL query for userSessionExists function.

servatrice/src/servatrice_database_interface.cpp

@@ -532,7 +532,8 @@ bool Servatrice_DatabaseInterface::userSessionExists(const QString &userName)
 {
     // Call only after lockSessionTables().
     
-    QSqlQuery *query = prepareQuery("select 1 from {prefix}_sessions where user_name = :user_name and end_time is null");
+    QSqlQuery *query = prepareQuery("select 1 from {prefix}_sessions where user_name = :user_name and id_server = :id_server and end_time is null");
+    query->bindValue(":id_server", server->getServerId());
     query->bindValue(":user_name", userName);
     execSqlQuery(query);
     return query->next();
@@ -803,4 +804,4 @@ bool Servatrice_DatabaseInterface::changeUserPassword(const QString &user, const
         return true;
     }
     return false;
-}
+}
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